摘要
文章通过CRTSⅢ型先张板与CRTSⅢ型后张板设计技术和制造技术的对比,介绍了CRTSⅢ型先张无砟轨道板创新技术,即(1)以双向先张工艺为前提的结构设计能使预应力钢筋与混凝土形成很强的握裹力,提高了轨道板的整体耐久性,避免了预应力钢筋断裂窜出的可能;(2)锚穴尺寸减小,增加了其周围混凝土的厚度,可有效控制锚穴处混凝土浅薄性微裂纹,减小了锚穴开裂的可能性;(3)实现了双向先张工艺制板的规模化生产,以矩阵坑单元生产模式取代后张板的单台座模式,每坑可生产2×4块板,实现了整体张拉及放张,有利于流水线生产,辅之以自动张拉设备,张拉精度及效率均得到提高;(4)由于结构中钢筋布置优化,使得钢筋用量大幅减少,节约了成本。基于郑徐客运专线的制板实践,介绍了有别于后张板的先张轨道板制造工艺流程及工装设备,并对有显著区别的张拉、蒸汽养护及放张工序的操作要点进行了介绍。
This paper introduces the innovative technology and manufacturing technique of CRTS Ⅲ type pre-tensioning ballastless track slab by contrasting with which of CRTSⅢtype post-tensioning ballastless track slab （1） The structure design on the premise of two-direction pre-tensioning technology can bring the prestressed reinforcement and the concrete into being strong bond stress which enhances the whole durability of the track slab and avoids the fracture and springing of the prestressed reinforcement. （ 1 ） Thickness of the concrete surrounding the anchor hole is increased with the de-crease of the anchor hole size which can effectively control the superficial micro cracks in concrete surrounding the an-chor hole and reduce the possibility of anchor hole cracking. （3） large-scale production of the slabs manufactured by two-direction pre-tensioning method is realized, with single pedestal model for post-tensioning slab replaced by matrix pit unit production model. 2 × 4 slabs can be produced for each pit while the whole tensioning and releasing of the pres-tressed reinforcement is realized in favor of the flow line production, the tension precision and efficiency can be improved by supplementing with the automatic tensioning device. （4） The cost can be saved due to remarkable reduction of the re-inforcement dosage quality by means of the optimization of the reinforcement layout in the structure. Based on the prac-tice of slabs manufacturing of Zhengzhou-Xuzhou passenger dedicated line, the manufacturing process flow, construction installation equipment used for track slab manufactured by pre-tensioning method are introduced, the operation key points of processes such as tensioning, steam curing and tension relaxation which are significantly different are also pres-ented.
出处
《高速铁路技术》
2015年第3期41-45,共5页
High Speed Railway Technology
基金
原铁道部重点课题(2012G005-A)"先张法预应力体系无砟轨道结构系统试验研究"
关键词
CRTSⅢ型先张板
创新技术
生产工艺
郑徐客运专线
CRTS Ⅲ slab manufactured by pre-tensioning method
innovative technology
manufacturing technique
Zhengzhou-Xuzhou passenger dedicated line
作者简介
王红亮（1964-），男，高级工程师。
